Application of Reinforcement by Pre-grouting in Long Borehole for Mechanized Longwall Passing through Faults

On the base of analysis of mechanism of grouting reinforcement for sliding destruction of block structure and dispersion leakage failure of fragmentation structure,and taking into account geological and mining conditions of 1413( 3) face in Zhangji Coal Mine,pre- grouting reinforcement technology was proposed to prevent roof from collapse in crack zone. Grouting material,grouting technology and mechanical properties of reinforcement parameters were analyzed. Engineering practice showed that pre- grouting reinforcement technology has good technical and economical benefits.